igneous
Dalmatian Stone and Lapis Lazuli
Dalmatian Stone (peralkaline rock) with Lapis Lazuli (metamorphic rock)
Dalmatian Stone: Hardness 5.5-6 on Mohs scale, cream-to-beige background with distinct black spots (arfvedsonite), vitreous to dull luster, massive habit. Lapis Lazuli: Hardness 5-5.5, deep royal blue color with specks of golden pyrite, dull to vitreous luster.
Identified More igneous →
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Physical properties
Dalmatian Stone: Hardness 5.5-6 on Mohs scale, cream-to-beige background with distinct black spots (arfvedsonite), vitreous to dull luster, massive habit. Lapis Lazuli: Hardness 5-5.5, deep royal blue color with specks of golden pyrite, dull to vitreous luster.
Formation & geological history
Dalmatian Stone forms as an igneous peralkaline rock primarily composed of feldspar, quartz, and arfvedsonite spots. Lapis lazuli forms through contact metamorphism of limestone.
Uses & applications
Primarily used in jewelry making as polished beads, cabochons, carvings, and ornamental gemstone items.
Geological facts
Dalmatian Stone is often misnamed 'Dalmatian Jasper', but geological analysis shows it is an igneous felsic rock rather than a chalcedony/jasper. The black spots are arfvedsonite, not tourmaline or hornblende as previously thought.
Field identification & locations
Identified by alternating polished beads of cream-colored stone with prominent black spots (Dalmatian stone) and rich deep blue beads (Lapis Lazuli). Widely sourced from Chihuahua, Mexico (Dalmatian Stone) and Afghanistan (Lapis Lazuli).
